Peter Corris' novel "Saving Billie" has his detective Cliff Hardy moving office to Newtown in Sydney, having found Kings Cross too gentrified. Perhaps Mr. Corris might like to set a story around the New Theatre. This has a rich history of involvement in left wing union politics and a cast of actors from TV soap operas.
Another spot would be the Hunter Baillie Church in Annandale. They run spring concerts with people who might be straight out of one of an English detective novel set in a village.